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I have the same mindset. If you are betting under your bet might be over after only half the game and you have no chance to win. When betting over there is always the chance until the 90th minute or whatever sport you are betting on. Also it's more exciting to see the points instead of hoping for them missing every shot they take.
All my parleys from last night missed by the way, not even getting close to a miracle. 15+ games in a parley and the best result was like hitting 10 only, haha. There are plenty on ncass games again today but I will wait until next weekend. Waiting for the miracle can wait for 1 more week.

Yes you named it, on a lucky occasion an "over 2.5" bet is done after 20 minutes into the game and that's it, and if it isn't as you said you still have the chance to see a wild 2nd half of the game. That's why betting "under" is really ugly, I hate it

But maybe you agree that in these external tournaments in Saudi Arabia or as I mentioned FIFA Club World Cup, you rarely see these crazy games with 4+ or 5+ goals. Maybe my view is biased for some reason and it's wrong? It is at least what I believe to remember. Didn't really do any fact checking on this one.
Are you going 15+ games parleys? Frankly, that's way too many for my taste. I see how it can be fun and I have done something like 10 games (you remember the physical oddset stores? That were the times I did 10 games slips with a best friend when we were 16 years old

) and I was sometimes close to winning, but it's tough as usually one top favorite wrecks your bet slip.